The document discusses the size and composition of the universe. It begins by defining what the universe contains, including empty space, energy, dark energy, and matter. It then explains the Big Bang theory, how the universe began as an incredibly small, dense point approximately 13.7 billion years ago and has been expanding ever since. It provides examples of scientific notation used to measure the vast distances within the universe from Earth to other galaxies. The document concludes by discussing potential futures of the universe, whether it will expand forever or potentially collapse back on itself in a "Big Crunch."

1. The Universe 6th Grade Science

2. I. What is it? A. Empty Space Nothing B. Energy 8th Grade C. Dark Energy (Expansion force) D. Matter 7th Grade E. Dark Matter (unseen matter)

3. II. Big Bang Universe is expand Hubble’s Law Farther away then the faster it is moving Cosmic Radiation Energy glow from all over the universe (from large explosion)

4. II. Big Bang B. Find starting position and time. Microscopic point in space (smaller than atom) 13.7 billion years ago C. No sound in space (was meant as a joke)

5. III. Size Scientific Notation 1,200 = 1.2 x 103 9,500,000,000,000,000 = 9.5 x 1015 Distances Diameter Earth 1.3 x 107 m Diameter Sun 1.4 x 109 m Diameter Andromeda 2 x 1021 m Known Universe 1 x 1026 m 100,000,000,000,000,000,000,000,000 m Light Year 1. Distance light travels in one year 2. Speed of light is 300,000 km/second

6. IV. Galaxies Huge cluster of stars, dust, and gas Held together by gravity Number (125 billion) Types Spiral Elliptical Irregular Quasars Very distant Very bright New Galaxy

7. IV. Galaxies E. Milky Way 1. 25,000 light years to center F. Biggest (IC1101 = 60 x our) G. Farthest (1689-2D1 13 billion LY)

8. V. Future Expand Forever End cold and dark Dark Energy – Increasing speed every day Big Crunch Return to original point in space Dark Matter - 90% of matter can not be seen Stars in galaxies should be flying away but don’t